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  • Articles  (34)
  • Zooplankton  (33)
  • GIY-YIG endonuclease
  • Instituto Oceanográfico de la Armada, Guayaquil, Ecuador  (32)
  • Oxford University Press  (2)
  • MDPI Publishing
  • 2005-2009  (34)
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  • Articles  (34)
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  • 1
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    Measurements of acoustic scattering from zooplankton and oceanic microstructure using a broadband echosounder (2009)
    Oxford University Press
    Details
    Publication Date: 2022-05-25
    Description: © 2009 The Authors. This article is distributed under the terms of the Creative Commons Attribution Non-Commercial License. The definitive version was published in ICES Journal of Marine Science: Journal du Conseil 67 (2010): 379-394, doi:10.1093/icesjms/fsp242.
    Description: In principle, measurements of high-frequency acoustic scattering from oceanic microstructure and zooplankton across a broad range of frequencies can reduce the ambiguities typically associated with the interpretation of acoustic scattering at a single frequency or a limited number of discrete narrowband frequencies. With this motivation, a high-frequency broadband scattering system has been developed for investigating zooplankton and microstructure, involving custom modifications of a commercially available system, with almost complete acoustic coverage spanning the frequency range 150–600 kHz. This frequency range spans the Rayleigh-to-geometric scattering transition for some zooplankton, as well as the diffusive roll-off in the spectrum for scattering from turbulent temperature microstructure. The system has been used to measure scattering from zooplankton and microstructure in regions of non-linear internal waves. The broadband capabilities of the system provide a continuous frequency response of the scattering over a wide frequency band, and improved range resolution and signal-to-noise ratios through pulse-compression signal-processing techniques. System specifications and calibration procedures are outlined and the system performance is assessed. The results point to the utility of high-frequency broadband scattering techniques in the detection, classification, and under certain circumstances, quantification of zooplankton and microstructure.
    Description: The work was supported by the US Office of Naval Research (Grant # N000140210359).
    Keywords: Broadband acoustic scattering ; Internal waves ; Oceanic microstructure ; Zooplankton
    Repository Name: Woods Hole Open Access Server
    Type: Article
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  • 2
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    Distribution and phylogeny of Penelope-like elements in eukaryotes (2009)
    Oxford University Press
    Details
    Publication Date: 2022-05-25
    Description: Author Posting. © Society of Systematic Biologists, 2006. This article is posted here by permission of Oxford University Press for personal use, not for redistribution. The definitive version was published in Systematic Biology 55 (2006): 875-885, doi:10.1080/10635150601077683.
    Description: Penelope-like elements (PLEs) are a relatively little studied class of eukaryotic retroelements, distinguished by the presence of the GIY-YIG endonuclease domain, the ability of some representatives to retain introns, and the similarity of PLE-encoded reverse transcriptases to telomerases. Although these retrotransposons are abundant in many animal genomes, the reverse transcriptase moiety can also be found in several protists, fungi, and plants, indicating its ancient origin. A comprehensive phylogenetic analysis of PLEs was conducted, based on extended sequence alignments and a considerably expanded data set. PLEs exhibit the pattern of evolution similar to that of non-LTR retrotransposons, which form deep-branching clades dating back to the Precambrian era. However, PLEs seem to have experienced a much higher degree of lineage losses than non-LTR retrotransposons. It is suggested that PLEs and non-LTR retrotransposons are included into a larger eTPRT (eukaryotic target-primed) group of retroelements, characterized by 5' truncation, variable target-site duplication, and the potential of the 3' end to participate in formation of non-autonomous derivatives.
    Description: This work was supported by the U.S. National Science Foundation (MCB 0614142).
    Keywords: Penelope-like elements ; Retrotransposons ; Reverse transcriptase ; GIY-YIG endonuclease
    Repository Name: Woods Hole Open Access Server
    Type: Article
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  • 3
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    Variación de la población del ictioplancton en el Pacífico Sur Oriental durante diciembre de 1997 (2008)
    Instituto Oceanográfico de la Armada, Guayaquil, Ecuador
    Details
    Publication Date: 2021-05-19
    Description: Uno de los principales objetivos de esta investigación es contribuir al estudio del ictioplancton y zooplancton durante el evento El Niño 1997 en el Pacífico Sur Oriental y a la vez relacionar la abundancia, migración y distribución de los diferentes grupos de organismos con los parámetros de temperatura y salinidad, con respecto a la variación de la población del ictioplancton
    Description: In the initial part of the VII antarctic expedition, between Guayaquil-Valparaíso, on board vessel B/I Orion of ecuadorian navy in december 1998, zooplankton samples were collected through horizontal and oblique drags using nets bongo 500µm. The purpose of the later analysis was to determine the ichthyoplankton population in the South Eastern Pacific. No stations were done in peruvian water.Total amount of 6380 eggs (10m²)-1 and 2173 larvas (10m²)-1 were estimated from the analysis. The fish eggs belonging to 8 orders, 13 families and 1 genera, while 7 orders, 14 families and 20 genera of fish larvae were registered. The highest concentration of fish eggs was registered in tropical superficial waters masses (ATS), suntropical superficial (ASS) and coastal peruvian waters (ACP). The fish larvae were more abundant in chileans coastal waters, where equatorial subsuperficial water masses (AESS), subtropical subsuperficial (ASS), subantarctic (ASA) and peruvian coastal (ACP) waters found Sardinops sagax y Thunnus sp., larvae were recorded in the south west of Gulf of Guayaquil. There were also identification of two species related with tropical waters, de Benthosema panamense y Myctophum sp. The most representative families in the study ares were Bathylagidae, Gonostomatidae, Scombridae y Myctophidae with the genera Diogenichthys sp., Gonichthys laternatun, Gonichthys sp, Lampanycthus sp., related with tropical species from the west. The presence, migration and distribution of the ichthyoplankton suggest a direct relationship with the temperature of the study area. The temperature and salinity have directly influenced the showing up and distribution of the ichthyoplankton, showed a migration to the North of Chile that coincided with the temperature decreasing.
    Description: Incluye ref.bibl.,grafs., ilus., tbls.
    Description: Published
    Keywords: Geographical distribution ; Zooplankton ; Environmental factors ; Population dynamics ; Fish larvae ; Ichthyoplankton ; Zooplankton ; El Nino phenomena ; Geographical distribution ; Environmental factors ; Population dynamics ; Fish eggs ; Fish larvae
    Repository Name: AquaDocs
    Type: Journal Contribution , Non-Refereed , Article
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  • 4
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    Condiciones del plancton en una estación fija: Puerto El Morro-Playas, Golfo de Guayaquil, 2000-2002 (2008)
    Instituto Oceanográfico de la Armada, Guayaquil, Ecuador
    Details
    Publication Date: 2021-05-19
    Description: En este estudio se examina la abundancia estructura poblacional y variación temporal del plancton, especialmente de copépodos en el Golfo de Guayaquil, a través de tres años de estudio, en condición no El Niño.
    Description: Changes on some oceanographic conditions as well surface planktonic community structure were studied during 33 months (December 1999- August 2002) at a fixed station in the Gulf of Guayaquil. Copepods, ostacods and decapod larvae were the most abundant zooplankton (300 µ mesh size) taxa, followed by fish larvae, chaetognaths, medusae, and mysidaceans. The lower abundance taxa were fish eggs, polychaeths, amphipods, pteropods, lamellibranch, cirriped larvae, and gasteropods. Phytoplankton was dominated by diatoms. The effect of the oceanographic variability on the zooplanktonic distribution, abundance, and population dynamics is unknown due to lack of appropriate continuity on sampling and analyses. The two most abundant copepod species were identified. Acartia danae dominated on the dry season, and Labidocera lubbocckii on the rainy season. Although, in general, copepod abundance was high, this diminished during the rainy seasons of 2000 (138-199 org/m3) and 2002 (175-327 org./m3), with relation to 2001 (1235-2238 org/m3). In march and april it was (6785 y 19887 org./m3). Ostracods, mainly Conchoecia sp., were relatively abundant (compared to copepods) and they were sometimes present in higher numbers. Decapods larvae were more abundand during the rainy season, specially in 2002. High abundance of copepods was find to be associated to lower water temperature, and decapod larvae, to higher temperatures. Diatoms were the main components of the phytoplankton community, with dominance of Skeletonema costatum, Coscinodiscus excentricus y Thalassiotrix frauenfeldii.
    Description: Incluye ref.bibl., grafs.
    Description: Published
    Keywords: Population structure ; Plankton ; Phytoplankton ; Distribution ; Zooplankton ; Diatoms ; Fish larvae ; Plankton ; Phytoplankton ; Abundance ; Distribution ; Zooplankton ; Marine crustaceans ; Fixed stations ; Population structure ; Diatoms ; Fish eggs ; Fish larvae
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  • 5
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    Diversidad del plancton en el estuario interior de Puerto Bolívar, Ecuador durante julio de 2002 (2008)
    Instituto Oceanográfico de la Armada, Guayaquil, Ecuador
    Details
    Publication Date: 2021-05-19
    Description: Los objetivos del presente estudio son:- Establecer el estado actual del plancton en el estero Santa Rosa, estero Jambelí y río Jubones durante las fases de flujo y reflujo. - Determinar la productividad, dominación y diversidad del plancton presentes en el área de estudio.
    Description: During the study was colected samples water on superficial at 27 stations, it was distributed in the Port Bolívar stuary with maing goal it to know primary productivity. the samples of plankton was colected in two phases: flux and reflux during the days 3 to 18 of july-2002. The diversity phytoplankton was identified to method Uthermohl 88 species in the lawyer superficial and 96 species were determined in samples net of 50u. In the phytoplankton community the diatoms were dominant and lower concentration the dinoflagellates, silicoflagellates, cyanobacter and cocolithophorides. In cell count the species the most dominant at the area were Skeletonema costatum and Pseudonitzschia delicatissima, in the net (50u) samples were registered the stuarine and benthic species: Skeletonema costatum, Cyclotella menenghiniana. It was destacated that the most phytoplankton diversity found in the areas river Jubones and the Santa Rosa stuary during the phase flux. The zooplankton community was registered hight diversity of groups zooplanktonic with a total of 32 and 28 taxa during flux and reflux respectivetly and terms of diversity max was registered a 2.19 bits found in the estero Jambelí. The high biomas of zooplankton it was observed during reflux in the station 14 and the lower biomas. It was found during flux in the station 5 localited in the estero Santa Rosa. The ichthyoplankton was registered low abundance of eggs and lavals of fish in the study area, and determinated. The number max of diversity were 0.8 bits observed in the area Punta Jambelí and determinated in the group of eggs of fish the following familys: Clupeidae, Sciaenidae, Engraulidae and the larval of fishes the dominant family was Engraulidae.
    Description: Incluye ref. bil., grafs.
    Description: Published
    Keywords: Biological production ; Plankton ; Phytoplankton ; Zooplankton ; Biomass ; Species diversity ; Species diversity ; Biological production ; Plankton ; Phytoplankton ; Zooplankton ; Biomass
    Repository Name: AquaDocs
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  • 6
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    Abundancia y distribución del ictioplancton, fito y zooplancton en el mar ecuatoriano en abril de 1995 (2008)
    Instituto Oceanográfico de la Armada, Guayaquil, Ecuador
    Details
    Publication Date: 2021-05-19
    Description: El presente trabajo trata de la distribución de la abundancia de huevos y larvas de peces en relación con la abundancia del zooplancton y fitoplancton colectado en 13 estaciones muestreadas a bordo del B/I TOHALLI durante el crucero pelágico-oceanográfico realizado en abril de 1995. Se analizó un total de 12820 huevos de peces. (10m²)¹ y 5145 larvas de peces (10m²)¹. La mayor abundancia de huevos y larvas de peces se localizó al este de las Islas Galápagos, en las estaciones 1P y 10, situadas en los extremos norte y sur del área de muestreo a la altura de la Isla San Cristóbal, con 5226 huevos (10m²)¹ y 1042 larvas (10m²)¹, respectivamente, mientras que la menor abundancia se localizó también al este de la Islas Galápagos, en las estaciones 7 y 5 con 109 huevos (10m²)¹ y 87 larvas (10m²)¹, respectivamente, y en las estaciones localizadas en el meridiano 83° W, frente a las provincias del Guayas y Manabí, con menos de 100 larvas (10m²)¹. Se reporta la presencia de larvas de Sardinops sagax en las estaciones cercanas a la Isla San Cristóbal. Huevos de Scomber japonicus y de engráulidos se identificaron cerca de esta isla. La familia ENGRAULIDAE se ausentó en el meridiano 83° W. Se identificaron larvas de peces pertenecientes a 17 familias, de las cuales, la familia MYCTOPHIDAE y GONOSTOMATIDAE fueron las más abundantes, representaron el 39% y 22% del total de larvas, respectivamente. Las áreas de abundancia de huevos y larvas estuvieron relacionadas con áreas de riqueza fito y zooplanctónica. Las mayores concentraciones de fitoplancton en aguas superficiales, más de 170000 células.m³, se dieron al este de Galápagos. Las menos concentraciones de fitoplancton se dieron en cambio a la altura del Golfo de Guayaquil, con 5000 células m³, lugar donde prosperó el zooplancton tanto en superficie como en profundidad, con 1800 y 2800 organismos.m³, respectivamente. Siguió en abundancia de zooplancton la zona norte de la Isla San Cristóbal tanto en superficie como en aguas profundas.
    Description: Incluye ref.bibl.,ilus.
    Description: Published
    Keywords: Phytoplankton ; Zooplankton ; Fish larvae ; Abundance ; Ichthyoplankton ; Phytoplankton ; Zooplankton ; Cruises ; Fish eggs ; Fish larvae
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  • 7
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    Aspectos ecológicos del plancton en las riberas del humedal Isla Santay, Río Guayas durante los años 2000 y 2002 (2008)
    Instituto Oceanográfico de la Armada, Guayaquil, Ecuador
    Details
    Publication Date: 2021-05-19
    Description: El objetivo del presente estudio es conocer la distribución cualitativa y cuantitativa de las especies del fitoplancton, zooplancton e ictioplancton y su relación con las condiciones ambientales durante el período en estudio.
    Description: The present work includes/understands the study of the qualitative and quantitative temporary variability of the phytoplankton, zooplankton and ichthyoplankton in the shores of the Santay Island, of the Province of the Guayas. For the effect 16 samples, obtained during november of the 2000 and january of the 2002 were analyzed. 38 species of phytoplankton in water samples and 51 species in network samples were identified (50u). The diatoms were dominant and in smaller concentration the dinoflagellates ones, cianobacterys, silicoflagellates, and tintinides. The cellular biomass was represented mainly by Skeletonema costatum, Paralia sulcata and Coscinodiscus excentricus, species that were abundant in the study area. In network samples species were observed estuarys and benthicas: Actinoptychus senarius, Coscinodiscus excentricus, C. concinnus, Polymixus coronalis, Cyclotella menenghiniana, characteristic of a high fertility. During year 2000 a smaller zooplanctónica biomass with a variability in the abundance of the main groups of zooplancton appeared, standing out the dominant group the Larvae of Fish and represented by the sort Anchovy sp. and its temporary abundance is influenced mainly by the seasonal time, physical factors and states of tides. Wheres during year 2002 a greater zooplanctónica biomass was observed and greater diversity of species, this biomass was represented mainly by microcrustaceans such as Nauplios of cirripedios, Copépodos, Zoeas of brachiuras, Copépodos, Larvae of fish and Larvae of poliquetos, in comparison with year 2000. The abundance of a fraction of some groups of zooplankton pertaining to meroplancton is an index that mainly characterizes productive areas by the presence of larval estadíos of crustaceans and fish.
    Description: Incluye ref.bibl., grafs., ilus.
    Description: Published
    Keywords: Plankton ; Phytoplankton ; Zooplankton ; Biomass ; Biological production ; Species diversity ; Marine ecology ; Species diversity ; Plankton ; Phytoplankton ; Zooplankton ; Ichthyoplankton ; Biomass ; Abundance ; Biological production ; Marine ecology ; Temporal variations
    Repository Name: AquaDocs
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  • 8
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    Variación mensual y mareal del zooplancton en una estación fija del estero del Muerto, Golfo de Guayaquil (2008)
    Instituto Oceanográfico de la Armada, Guayaquil, Ecuador
    Details
    Publication Date: 2021-05-19
    Description: Durante los meses de Marzo de 1983 a Febrero de 1984, se llevaron a cabo muestreos de 24 horas consecutivas en las fases llenas lunares en una estación fija en la región interior del Golfo de Guayaquil. Con esta información se han determinado variaciones mensuales y mareales del zooplancton, así como de otros parámetros ambientales, encontrándose una estrecha relación entre la abundancia de organismos y los valores de salinidad. La mayor biomasa planctónica estuvo asociada con los meses secos de alta salinidad. Analizando la variación mareal, se ha determinado que durante las mareas, existe aporte de material nutritivo desde el interior del estuario hacia la región exterior.
    Description: Incl. ref.bibl., grafs., ilus.
    Description: Published
    Keywords: Zooplankton ; Biomass ; Seasonal variations ; Zooplankton ; Biomass
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  • 9
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    Contribución al conocimiento del género Bolivina D'Orbigny 1839, (Foraminífero) en el Golfo de Guayquil (2008)
    Instituto Oceanográfico de la Armada, Guayaquil, Ecuador
    Details
    Publication Date: 2021-05-19
    Description: Se analizaron 29 muestras de fondo en el presente estudio, entre las profundidades de 13 y 1958 m, colectadas durante el crucero R/V "Eastward", en octubre de 1976, (Tabla 1). Se identificaron un total de 11 especies del género Bolivina: B. acutula Bandy; B. alata (Seguenza); B. globulosa Cushman; B. interjuncta, f. typica Cushman; B. pacifica Cushman & McCulloch; B. plicata D'Orbigny; B. pseudoplicata Heron-Allen & Earland; B. pseudobeyrichi Cushman, f. bradyi Asano; B. subadvena serrata Natland; B. cf. spissa Cushman y B. tongi Cushman.
    Description: Twenty nine bottom samples have been analized in this study, between 13 and 1598 m. of depth, that were collected in october 1976 during the oceanographic expedition R/V "Eastward". (Plate 1). Eleven species of genera Bolivina have been identified: B. acutula Bandy; B. alata (Seguenza); B. globulosa Cushman; B. interjuncta, f. typica Cushman; B. pacifica Cushman & McCulloch; B. plicata D'Orbigny; B. pseudoplicata Heron-Allen & Earland; B. pseudobeyrichi Cushman, f. bradyi Asano, B. subadvena serrata Natland; B. cf. spissa Cushman y B. tongi Cushman.
    Description: Incluye ref.bibl., ilus., tbls.
    Description: Published
    Keywords: Geographical distribution ; Zooplankton ; Foraminifera ; Geographical distribution ; Zooplankton
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  • 10
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    Variación temporal del zooplancton de una estación fija en Bahía Academia (Galápagos) período 1986-1988: Su relación con la temperatura superficial (2008)
    Instituto Oceanográfico de la Armada, Guayaquil, Ecuador
    Details
    Publication Date: 2021-05-19
    Description: El presente trabajo se basa en el estudio cuali-cuantitativo y de diversidad de 95 muestras de plancton colectadas semanalmente en aguas superficiales costeras en una estación fija localizada en Bahía Academia, Isla Santa Cruz (Galápagos) durante septiembre 1986-septiembre 1988. Se exponen 27 grupos de organismos de zooplancton, siendo los dominantes, los copépodos, larvas de decápodos, huevos de peces, lamelibranquios, ostrácodos, pterópodos y apendicularios; y los más frecuentes, copépodos, larvas de decápodos, huevos de peces, pterópodos, apendicularios, quetognatos, lamelibranquios y larvas de peces. Se determinan los diversos géneros de copépodos, siendo las especies más abundantes en orden decreciente: Acartia levenquei, Pseudodiaptomus galapaguensis y Nannocalanus minor. La temperatura superficial del mar (TSM) durante el período de análisis, mostró su valor más alto en abril 87, con 28,8°C y el más bajo en julio 88, con 19,2°C.
    Description: Incluye ref.bibl., grafs.
    Description: Published
    Keywords: Zooplankton ; Coastal waters ; Temporal variations ; Zooplankton ; Coastal waters ; Surface temperature
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  • 11
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    Bioecología de huevos y larvas de peces Cetengraulis mysticetus (Chuhueco), Opisthonema sp. (Pinchagua) y Anchoas en la reserva ecológica manglares Cayapas-Mataje - Ecuador (2008)
    Instituto Oceanográfico de la Armada, Guayaquil, Ecuador
    Details
    Publication Date: 2021-05-19
    Description: La presente investigación es parte del Convenio de Cooperación Técnica entre el Fondo Ecuatoriano Populorum Pregressio (FEPP) y el Instituto Nacional de Pesca (INP) y tiene como fin principal el estudio de huevos y larvas de chuhueco (Cetengraulis mysticetus), anchoas (Anchoa sp., Anchovia sp. y Engraulis) y pinchagua (Opisthonema sp.) en relación con abundancia y distribución de la microfauna zooplanctónica presente en los esteros durante el período comprendido entre abril del 2000 y diciembre del 2001.
    Description: This paper is about eggs and larval stages of Cetengraulis mysticetus (chuhueco), Engraulis, Anchoa sp., Anchovia sp. (anchovies) and Opisthonema sp., (pinchagua) research, and their relation with the micro zooplankton distribution collected in 22 stations located in the inner channels and coastal waters of Ecological Reserve Cayapas-Mataje (REMACAM) - Province of Esmeraldas, from april 2000 to december 2001. These fish larvae characterized the coastal and estuarine waters of Santa Rosa, Limones (C. mysticetus and Anchovia sp.) and Olmedo (Anchoa sp.) especially from august to december. Opisthonema sp. fish larvae characterized the northern zone of the REMACAM, in front of Campana town in the Mataje River on june 2001 and also in the central zone towards on a side of the Bolivar Channel, San Lorenzo and Isla de los Pájaros in Tambillo River on august and december 2001. The spawn of chuhueco fish and anchovies found on august and november 2001 increased in the inner channel of the north and central zone, from the mouth of the Mataje River, Canal de la Caida to San Lorenzo. Associated coastal processes to own oceanic conditions of "La Niña" event, during year 2000 and the tendency to a normalization of the marine ecosystem at the end of the 2001, they would be related to a greater micro zooplankton production (chaetognatha, copepoda, veliger larvae of mollusks, zoea of brachyuran) observed in the year 2000 and to reductions in the density of zooplankters and greater spawn of engraulis in the year 2001. The amount of phosphates nitrates and chlorophyll correlated positively with rises in the density of clupeiformes eggs and fish larvae.
    Description: Incluye ref.bibl., ilus., grsf.
    Description: Published
    Keywords: Zooplankton ; Eggs ; Larvae ; Mangroves ; Zooplankton ; Ichthyoplankton ; Eggs ; Larvae ; Mangroves
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  • 12
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    Composición y distribución de la biomasa del plancton en el frente ecuatorial (2008)
    Instituto Oceanográfico de la Armada, Guayaquil, Ecuador
    Details
    Publication Date: 2021-05-19
    Description: Este trabajo presenta los resultados de la distribución de la biomasa y composición del fitoplancton y zooplancton en el frente ecuatorial, cuya presencia caracteriza las condiciones consideradas como "normal" para el sistema de circulación oceánica del Pacífico Tropical.
    Description: Incluye ref.bibl., ilus.
    Description: Published
    Keywords: Distribution ; Biomass ; Phytoplankton ; Zooplankton ; Composition ; Distribution ; Biomass ; Cruises ; Phytoplankton ; Zooplankton
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  • 13
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    Variación mensual del plancton en una estación fija La Libertad (Salinas), Ecuador. Período: 1988 - 1989 (2008)
    Instituto Oceanográfico de la Armada, Guayaquil, Ecuador
    Details
    Publication Date: 2021-05-19
    Description: El presente trabajo es el resultado del estudio cuali-cuantitativo de análisis de plancton colectado mediante muestreos mensuales en aguas superficiales costeras en una estación fija en La Libertad (Salinas) entre diciembre 1988 y diciembre 1989. Se dan a conocer 29 grupos de organismos del zooplancton, determinándose que los dominantes en orden decreciente fueron: larvas de eufáusidos, quetognatos, apendicularios, larvas de decápodos, huevos de peces, foraminíferos, cladóceros, huevos de decápodos y los más frecuentes: copépodos, apendicularios, quetognatos, larvas de decápodos y huevos de peces. Se presentan las especies más abundantes y dominantes de copépodos en orden decreciente: Acartia levequei, Centropages furcatus y Temora discaudata. Se determina que el zooplancton fue poco homogéneo durante el período de estudio en esta localidad, registrándose bajas concentraciones en los primeros meses del año (época de invierno), altas concentraciones en el mes de mayo y medianas concentraciones a partir de junio en adelante. Se presentan valores superficiales de temperatura y salinidad. La temperatura superficial del mar (TSM) más alta se observó en marzo 1989 con 28°C y la más baja en julio 1989 con 21.5°C.
    Description: Incluye ref.bibl., grafs.
    Description: Published
    Keywords: Plankton ; Zooplankton ; Salinity ; Temperature ; Plankton ; Zooplankton ; Seasonal distribution ; Geological distribution ; Salinity ; Temperature
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  • 14
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    Composición, distribución y abundancia relativa de copépodos pelágicos calanoideos y no calanoideos en aguas ecuatorianas durante el evento La Niña en septiembre de 2001 (2008)
    Instituto Oceanográfico de la Armada, Guayaquil, Ecuador
    Details
    Publication Date: 2021-05-19
    Description: El presente trabajo es una contribución para el conocimiento de la oceanografía biológica de la región ecuatorial tropical donde se manifiestan estas importantes perturbaciones climáticas.
    Description: The present study is based on the plankton samples collected in the cruise carried out by the Oceanographic Institute of the Equatorian Navy during september 2001. For this study 10 zooplankton samples was analyzed and corresponding to five coastal stations, located approximately in a transect between 81 W and from 1° N to 3°S. 8,208 organisms belonging to 23 families, 43 genus and 97 copepods species were identified. For each station was obtained the percentages of males and females, and the total average for the five stations too. Of the total of identified species 72.51% corresponded to females specimens and 27.49% to males specimens. The distribution of the copépodos species was associated to the conditions oceanographic that were presented during september of 2001. The copepods species of the south of the coast of the Ecuador, they were conformed mainly by species of cold waters, associated to a strong influence of the Humboldt Current that would have contributed to the displacement of characteristic species of cold waters, from the costs of Chile and Perú toward the costs of Ecuador. While in waters of intermediate temperatures, they were species conformed mainly by a transition fauna between cold waters of the south and the warm of the north. On relationship to the station more to the north, the copepods were conformed mainly by species of warm waters. This way, new expectations about the study of biological indicators in the oceanography one could wait, with the analysis and study of the climatic variability and their effect in the populations of the plankton in the ocean.
    Description: Incluye ref.bibl., grafs., tbls.
    Description: Published
    Keywords: Plankton ; Zooplankton ; Geographical distribution ; Marine ecology ; Indicator species ; Community composition ; Marine crustaceans ; Abundance ; Plankton ; Zooplankton ; Marine ecology ; Indicator species ; El Nino phenomena ; Geographical distribution
    Repository Name: AquaDocs
    Type: Journal Contribution , Non-Refereed , Article
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  • 15
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    Composición, distribución y abundancia del plancton en el estuario de San Lorenzo, Esmeraldas - Ecuador (2008)
    Instituto Oceanográfico de la Armada, Guayaquil, Ecuador
    Details
    Publication Date: 2021-05-19
    Description: El presente trabajo es una contribución al estudio del plancton estuarino presente en el área comprendida del Canal de San Lorenzo, provincia de Esmeraldas, para lo cual existe poca información sobre este tema.
    Description: The present work comprehends the study of the qualitative and quantitative distribution of the phytoplankton, zooplankton and ichthyoplankton at San Lorenzo in Esmeraldas Province. For the effect 12 stations were established located at the Estero Chimbusal, Estero Nadadero, Canal de San Lorenzo. The sample was taken in the phases flow and refflux the days ist and 2nd of september 2001. There were identified 63 species in water samples and 77 species in samples with net of 50u in the community of the phytoplankton. The diatoms prevailed dominant and in smaller concentration the dinoflagellates, tintinnoids, cianobacters and flagellates. The cell biomass was represented by Messodinium rubrum and Chaetoceros compressus, they were the most abundant species in all the area. In net samples of 50u the dominant species were: Biddulphia sinensis, B.mobiliensis, Chaetoceros compressus, Pleurosigma angulatum and Skeletonema costatum, tytical of a high fertility in the area. The regimen refflux registered 17 taxas of zooplankton an the dominants were Copepods (35%), Chaetognaths (34%) and the Crustacean Larvae such as Zoeas of Brachyuran (11%). The regimen flow showed 14 taxas and were evident the Copepods (60%), Fish Larvae (21%) these groups of zooplankton were considered dominant and frequent. With regard to Ichthyoplankton registered in the regimen flow 3462 fish eggs/10m², the dominant families were Engraulidae (62%), Clupeidae (33%), however it was observed a high abundance of fish larvae with a total 11495/ 10m² and registered the dominant families Clupeidae (40%), Engraulidae (37%) and Scianidae (16%). The regimen refflux presented the biggest abundance on eggs of fish with 19649 eggs/ 10m². The dominant families were Clupeidae 68% and Engraulidae 31%, the fish larvae were low on abundance with 826 larvas/10m² being the dominant families Clupeidae (57%), Scianidae (24%) and Engraulidae (14%).
    Description: Incluye ref.bibl., grafs.
    Description: Published
    Keywords: Distribution ; Plankton ; Phytoplankton ; Zooplankton ; Biomass ; Diatoms ; Distribution ; Composition ; Abundance ; Plankton ; Phytoplankton ; Zooplankton ; Ichthyoplankton ; Diatoms ; Biomass
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  • 16
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    Plancton alrededor de las Islas Galápagos durante el crucero oceanográfico efectuado en mayo de 2004 (2008)
    Instituto Oceanográfico de la Armada, Guayaquil, Ecuador
    Details
    Publication Date: 2021-05-19
    Description: El presente trabajo comprende la composición y distribución del plancton en las Islas Galápagos. Para el efecto se establecieron 13 estaciones ubicadas en las secciones 92° - 90° y 89° W, realizadas en mayo del 2004.
    Description: The paper has reference of the composition and distribution of the species the phytoplankton and zooplankton around of Galapagos Islands. It was established 13 stations located in the sections folowing 92°-90° y 89° west, carry out during in may of 2004. It was identificated 58 species phytoplankton in water example and 70 species in net (50u). The diatoms were dominants and low concentration was registered the Dynoflagellates, Cocolitophorides, Silicoflagellates, Cianobacters, Tintinnoids. The cellular biomass were represented main the species Mesodinium rubrum y Gynodinium sp. that were the high abundance, coincidental with the species obtained of net example was registered Rhizosolenia hebetata and Thalassiosira subtilis that characteristic the most productivity in the sections 90° West and 1° sur. The zooplankton were registered 17 taxa of zooplankton representated the groups dominants the Copepods (35%), Chaetognaths (34%), and Zoeas of Brachiuras (11%) and it were frecuent around the Galapagos Islands. The species of chaetognathas was registered the dominance Sagitta enflata asociated S. pacifica with the hight density of individuals localizated in the section 90°W and 1° north in the surface. Aditionally it was registered the species Sagitta hexaptera determinance the hight abundance in the subsurface in the section 89°W between the 1° to 3° southeastern of the Galapagos Islands.
    Description: Incluye ref.bibl., grafs., ilus.
    Description: Published
    Keywords: Biomass ; Plankton ; Distribution ; Phytoplankton ; Zooplankton ; Diatoms ; Plankton ; Community composition ; Distribution ; Phytoplankton ; Zooplankton ; Diatoms ; Biomass ; Cruises
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  • 17
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    Los eufáusidos en el Pacífico sudeste (03°16'S-31°23'S) durante el evento "El Niño", diciembre de 1997 (2008)
    Instituto Oceanográfico de la Armada, Guayaquil, Ecuador
    Details
    Publication Date: 2021-05-19
    Description: El objetivo de este trabajo es establecer las especies de eufáusidos que caracterizan a las masas de agua en el Pacífico sudeste durante "El Niño 1997".
    Description: This study concerns the distribution, composition and relative abundance of euphausiids in the Southeastern Pacific Ocean, in december de 1997, during "El Niño conditions". Thirteen species were identified from approximately 1619 org/m³ and they are: Stylocheiron sp., S. carinatum; S. affine; S. elongatum, S. longicorne; Nematoscelis sp., N. microps; Nematobrachion flexipes; Euphausia eximia; E. tener; E. lamelligera; E. gibboides; E. distinguenda; E. diomedae y Nyctiphanes simplex. Eleven of the euphausiids live in epipelagic marine environment, and only two are mesopelagic. Sixty-nine percent of the species were located in their respective latitudinal zones (Brinton, 1962, Boltovskoy,1975; Cornejo de González, 1980, Antezana, 1981), excep: Euphausia eximia that normally is distributed between 40°N - 30°S; E. lamelligera between 25°N-10°S; E. distinguenda between 30°N-20°S,y E. diomedae between 25°N-25°S. These four species extended their southward distribution to 31°23?S, in waters with temperatures of 17.9°C and 11.6°C; and salinities of 34.4‰ and 34.6‰, from 0 and 200 m. de profundidad, respectively. This study demostrates the increased distribution of four species of euphausiids in the Southeastern Pacific Ocean during "El Niño 1997-1998".
    Description: Incluye ref.bibl., grafs., tbls.
    Description: Published
    Description: Krill
    Keywords: Distribution ; Zooplankton ; Species diversity ; Distribution ; Abundance ; Marine crustaceans ; El Nino phenomena ; Species diversity ; Zooplankton
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    Type: Journal Contribution , Non-Refereed , Article
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  • 18
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    Composición del plancton en la Puntilla Santa Elena durante agosto 2002 (Ecuador) (2008)
    Instituto Oceanográfico de la Armada, Guayaquil, Ecuador
    Details
    Publication Date: 2021-05-19
    Description: Esta investigación comprende los estudios del fitoplancton-zooplancton-ictioplancton, realizados en tres sitios de la Península Santa Elena durante agosto 2002, área designada para la proyección de "Arrecife Artificial de las Fuerzas Militares del Ecuador": un avión, barco y tanque de guerra, estructuras artificiales consideradas como basura chatarra (de gran tamaño), que serían recicladas para la bio-exploración artificiales hacia la seguridad de los recursos marinos del Ecuador. En el Estudio Ambiental se describen las consideraciones necesarias de carácter multidisciplinario (EIA-INOCAR, 2002).
    Description: The objective of the present study was to carry out a assess of plankton productivity nearest of the Puntilla Santa Elena, for the projection of future Artificial Reefs, carried out by the Oceanographic Institute of the Ecuadorian Navy, during august 2002. The investigated area presented high concentrations of primary and secondary productivity in the column of water (0-10m), with certain daily fluctuation characteristic of the trphic coastal systems that shows the circulation of the coastal currents and submarine topography. The main alimentary complements were the centric diatoms with high chlorophyll (Phytoplankton); the copepods and cladocera were the representative in the second level trophic (Zooplankton). It was a high diversity of fish eggs and larvae, information that would confirm that this sector is an spawn area for this month. The high diversity of crustaceans larvae, makes show off that the substrates of artificial reefs will be an attraction for crabs, shrimp and other crustaceans. Although the stadiums of sessile benthic organisms presented low density of briozoos larvae, cirrepedios, shells (bivalve mollusks and gastropods), they would be those that would populate the superficial layer of the new artificial structures. These marine organisms of the food chain constitute an excellent natural resource for fish and invertebrate organisms, consequently the artificial reefs would be favorable for the reception of the sessile organisms (as macroalgae and corals) and refuge area to alimentary support for other organisms like the fish.
    Description: Incluye ref.bibl., grafs., tbls.
    Description: Published
    Keywords: Biological production ; Plankton ; Zooplankton ; Phytoplankton ; Artificial reefs ; Biological production ; Artificial reefs ; Plankton ; Zooplankton ; Phytoplankton ; Ichthyoplankton
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  • 19
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    Aporte al conocimiento del zooplancton de agua dulce y estuarina del río Guayas. Guayaquil - Ecuador (2008)
    Instituto Oceanográfico de la Armada, Guayaquil, Ecuador
    Details
    Publication Date: 2021-05-19
    Description: El presente trabajo corresponde al análisis de zooplancton colectado en cinco estaciones localizadas en el río Guayas. La primera estación estuvo situada 10 km. río arriba de la confluencia del río Babahoyo con el río Daule, en un pozo acuífero. Las otras estaciones se situaron en cuatro sitios consecutivos a lo largo del río Guayas. En este trabajo se han identificado 10 especies: Brachionus plicatilis (O. F. Muller) (Rotifera), Alona cambouei Guerne and Richard, 1893; Moina micrura Kurz, 1874 (Cladocera); Acartia tonsa Dana, 1848; Oithona dissimilis Linberg, 1940; Oithona neotropica Herbs, 1967; Oithona oligohalina Fonseca o Bjornberg, 1976; Mesocyclops longisetus (Thiebaud, 1914) y Pseudodiaptomus longispinosus Chad, 1989 (Copepoda). Las especies identificadas en el río Guayas correspondieron a hábitat de aguas ecuatorianas.
    Description: Five zooplankton stations have been analized. The first one was a pond sitiated 10 Km. away from the confluence of the Babahoyo and Daule rivers. The rest of stations came from four consecutive points in the Guayas river iincluding the brackish water area at the mouth of the river. A total of ten taxa have been recorded in this report. These are: Brachionus plicatilis 8O. F. Muller) (Rotifera), Alona cambouei Guerne and Richard, 1893; Moina micrura Kurz, 1874 (Cladocera); Acartia tonsa dana; 1848; Oithona dissimilis Lindberg, 1840; Oithona neotropica Herbst, 1967; Oithona oligohalina Fonseca o Bjornberg, 1976; Mesocyclops longisetus (Thiebaud, 1914) and Pseudodiaptomus longispinosus Chad, 1989 (Copepoda).
    Description: Incluye ref.bibl.,ilus., tbls.
    Description: Published
    Keywords: Zooplankton ; Geographical distribution ; Rivers ; Estuaries ; Brackishwater environment ; Zooplankton ; Freshwater ; Geographical distribution ; Rivers ; Estuaries ; Brackishwater environment
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  • 20
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    El zooplancton de las Islas Galápagos (2008)
    Instituto Oceanográfico de la Armada, Guayaquil, Ecuador
    Details
    Publication Date: 2021-05-19
    Description: El presente trabajo es el resultado de un análisis cuali-cualitativo de 84 muestras de plancton colectadas en aguas costeras (10.-0 m de profundidad) en diez localidades de las Islas Galápagos entre Agosto de 1975 - Julio de 1976. Se da a conocer 29 grupos de organismos del zooplancton, determinándose que los grupos dominantes en las estaciones objeto de este estudio y en orden decreciente de su abundancia fueron: Copépodos, Pterópodos, Apendiculares, Quetognatos, Decápodos y Huevos de Peces. Se hacen evaluaciones del volumen de plancton y de la cantidad de organismos del zooplancton. Se detrmina que la distribución del zooplancton fue poco homogénea en las localidades estudiadas. mayores concentraciones se registraron hacia la parte central del Archipiélago. Medianas concentraciones hacia el Sur-Este. Baja concentración hacia el Occidente (Punta Espinosa). Se presentan datos de temperatura y salinidad superficiales, su distribución en las Islas y su posible influencia sobre el zooplancton. El zooplancton de las Islas durante el tiempo de estudio presenta un elevado grado de afinidad poblacional (en variedad de grupos). Finalmente se establece que el zooplancton de las Islas durante la época de estudio fue eminentemente nutritivo.
    Description: Incl. ref.bibl., grafs., tbls.
    Description: Published
    Keywords: Zooplankton ; Geographical distribution ; Coastal waters ; Zooplankton ; Coastal waters ; Geographical distribution ; Abundance
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  • 21
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    Diagnóstico del plancton en el estuario de San Lorenzo en agosto 2006 (Esmeraldas-Ecuador) (2008)
    Instituto Oceanográfico de la Armada, Guayaquil, Ecuador
    Details
    Publication Date: 2021-05-19
    Description: Se realizó un monitoreo del plancton en el estuario de San Lorenzo en junio 2006. En los resultados se registró 128 especies del fitoplancton (método cuantitativo) y 50 especies (cualitativo). Las diatomeas más representativas fueron S. costatum, T. nitzschioides, P. longissima, L. danicus, Navicula sp., P. sulcata: T. nitzschioides. Thalassiosira sp. y flagelados (cuantitativo); S. costatum, Coscinodiscus sp., N. sigma y P. Sulcata (cualitativo). La presencia de Gymnodinium sp. P. maximun y M. rubrum podría asociarse con la formación de mareas rojas al interior del estuario. En los resultados del zooplancton registrarón 16 taxas constituidos mayoritariamente por Zoeas de Brachiura y Copépodos, distribudidos en toda el área de estudio principalmente en las estaciones 6 y 7 cercanas a la confluencia del río Nadadero Grande y el Canal San Lorenzo, coincidente con la mayor biomasa del fitoplancton y zooplancton que serian propias del estuario con poco intercambio de masas de aguas externas. Los índices de diversidad reflejan valores intermedios entre 2 a 3 bits/cel tanto para el fitoplancton y zooplancton. Los esteros y efluentes que conforman el Canal de San Lorenzo, sector considerado como un nicho ecológico de importancia pesquera y planctónica asociado al manglar en la comunidad de San Lorenzo.
    Description: The plankton monitoring in the San Lorenzo estuary in june 2006. Were registered 128 species of the phytoplankton (cuantitative method) and 50 species (cualitative). The most representative diatomeas were S. costatum, T. nitzschioides, P. longissima, L. danicus, Navicula sp., sulcata P. ; T. nitzschioides, Thalassiosira sp. and flagellated (cuantitative); S. costatum, Coscinodiscus sp., N. sigma and P. sulcata (qualitative). The presence of Gymnodinium sp., P. maximun and M. rubrum could be associated with future risks for the formation of red tides in this estuary. In the results its Zooplancton registered 16 mainly taxas constituted by Brachyura Zoea and Copepods, distributed in the whole area of study mainly in stations 6 and 7 near the confluence of the Nadadero Grande river and the San Lorenzo estuary, coincident with the high biomass of the phytoplankton. Ichthyoplankton registered abundance of egg stages of fish in station 4 and larvae of fish in station 7, sites that could be considered like ecological niches of high biological productivity. The diversity indices reflect intermediate values between 2 to 3 bits/cel for the phytoplankton and zooplankton. The estuaries and effluents that conform the San Lorenzo channel, this area is considered like an associated ecological niche the fishing importance and the plankton biodiversity when mangrove in the community of San Lorenzo.
    Description: Incluye ref.bibl., grafs., ilus.
    Description: Published
    Keywords: Zooplankton ; Biomass ; Eggs ; Estuaries ; Plankton ; Phytoplankton ; Fish larvae ; Species diversity ; Diatoms ; Plankton ; Diatoms ; Phytoplankton ; Zooplankton ; Biomass ; Fish larvae ; Eggs ; Abundance ; Estuaries ; Species diversity
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  • 22
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    Relación fitoplancton-zooplancton en el Pacífico Ecuatorial (Ecuador), durante septiembre 2001 (2008)
    Instituto Oceanográfico de la Armada, Guayaquil, Ecuador
    Details
    Publication Date: 2021-05-19
    Description: El presente trabajo es una contribución al conocimiento de la bio-oceanografía del mar ecuatoriano, forma parte del proyecto de Monitoreo de las condiciones oceanográficas en el mar ecuatoriano y su relación con eventos de El Niño, realizadas en el B/I ORION del Instituto Oceanográfico de la Armada (INOCAR) en septiembre-octubre 2001, como un aporte a la comunidad científica.
    Description: The present research corresponds to the cruise carried out by the Oceanographic Institute of the Ecuadorian Navy in september 2001, between 89°W - 81°1W and 1°N - 3°3S. The distribution of plankton populations associated with upwelling areas of the coastal brunch of the Humboldt Current in the Gulf of Guayaquil, and toward the Galápagos, upwelling of the Cromwell Current, forming patches in the central region and toward the Gulf of Guayaquil, is decribed. Increased phytoplankton (diatoms) production was found south of the equatorial region, coincident with the presence of dinoflagellates species of warm-oceanic waters allowing slight mixed areas. The higher abundance of zooplankton (copepods) were found to the east of the Galápagos Islands, decreasing toward the continent. These bio-geographic conditions point to higher productivity areas to the south and lower productivity areas to the north of the studied area, characterized by the position of the equatorial front. A. patch the high biological productivity was also evidenced in the oceanic region, atypical condition associated to the global cooling of the La Niña event, and/ or advances of upwelling waters toward the continent, processes of great importance for the pelagic resources of Ecuador.
    Description: Incluye ref.bibl., grafs.
    Description: Published
    Keywords: Biological production ; Geographical distribution ; Phytoplankton ; Zooplankton ; Population density ; Diatoms ; Phytoplankton ; Diatoms ; Zooplankton ; Biological production ; Upwelling ; Population density ; Cruises ; Abundance ; Geographical distribution
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  • 23
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    Distribución y abundancia del plancton estuarino en el Canal El Morro, Posorja (junio 2006) (2008)
    Instituto Oceanográfico de la Armada, Guayaquil, Ecuador
    Details
    Publication Date: 2021-05-19
    Description: El proyecto de "Gestión Ambiental de la Armada" en el área estuarina adyacente al reten Naval de Posorja, tuvo como objetivo realizar un muestreo de plancton y sus condiciones ambientales actuales, a fin de conservar los ecosistemas marino-costeros y su diversidad biológica para el beneficio de la población local, la ciencia y educación establecido en la estrategia de desarrollo sustentable adaptadas al Cambio Climático (Gaibor, et al., 2000).
    Description: During the phytoplankton and zooplankton studies in the Morro Channel near to Posorja Navy in april/2006. The phytoplankton communities are identify 94 species (quantitative) and 81 species (qualitative), being the centric and pennate diatoms the most frequent group in both methodologies. The abundant and frequent species were Thalassiosira sp., T. nitzschiodes, Navicula sp., P. sulcata, S. costatum (0m); T. nitschioides, S. costatum, P. sulcata, M. nemuloides (bottom of the column of water); and in the qualitative analysis the most abundant species were S. costatum, T. nitzschioides, P. sulcata, Chaetoceros curvisetus. In consideration to the harmful phytoplankton, the presence of Prorocentrum maximum, Dinophysis caudata and Noctiluca scintillans species that it have provoked blooms causing red tides in the Gulf of Guayaquil (intern and external). The zooplankton was evidenced 25 groups represented by micro-crustacean (copepod, brachyura zoeas, cirripedia larvae, eufáusidos, decapods and other groups like the chaetognata. The component ichthyoplankton registered low density of larval stadiums of fish. The diversity indexes reflect security intermissions between 2 to 3 bits/cell of the plankton.
    Description: Incluye ref.bibl., grafs., tbls.
    Description: Published
    Keywords: Phytoplankton ; Zooplankton ; Estuaries ; Geographical distribution ; Phytoplankton ; Zooplankton ; Abundance ; Estuaries ; Geographical distribution
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  • 24
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    Bio-oceanografía en el entorno de la isla de La Plata, durante agosto/2001 (2008)
    Instituto Oceanográfico de la Armada, Guayaquil, Ecuador
    Details
    Publication Date: 2021-05-19
    Description: El objetivo de la presente investigación, fue dar un comprensivo entendimiento de las condiciones bio-oceanográficas del fitoplancton-zooplancton-ictioplancton, y las interacciones con el medio circundante (físico, químico), procesos que son complicados cuando involucran aspectos hidrográficos costeros como áreas de afloramiento, áreas de pesca y áreas de soporte alimentario para los diferentes recursos marinos costeros planctónicos-bentónicos y aves-mamíferos marinos.
    Description: The oceanographic Institute of the Ecuadorian Navy carried out a coastal cruise around La Plata Island in August 2001 onboard the R/V RIGEL. The main objective was to study the distribution and interaction of ecological variables affecting phyto-zooplankton and ichthyoplankton, as a tool for the evaluation of coastal marine resources. An important aspect is the bathymetry of the area influencing the biological component. Shallower waters are found southwards allowing the occurrence of upwelling and advection processes that bring nutrient rich waters to the surface. This is shown by the high chlorophyll "a" content found in the south, favorable for phyto- and zooplankton production, also abundant in that region. The cellular biomass was composed by species that are indicative of mixed waters, warm-oceanic and upwelling waters with increased abundance towards the south. The tendency of increased biological productivity in the southern margin of La Plata Island is coincident with other ecosystems such as the Galápagos Islands and Santa Clara Island. These southern areas area important ecological niches, i.e. birds and marine mammals, decisive for coastal marine resources support. It is of extreme importance to continue the vigilance and control of these areas, specially due to the negative effects that the proximity of commercial marine traffic may produce.
    Description: Incluye ref.bibl., grafs.
    Description: Published
    Keywords: Marine resources ; Phytoplankton ; Zooplankton ; Biological production ; Marine ecology ; Marine ecology ; Phytoplankton ; Zooplankton ; Ichthyoplankton ; Upwelling ; Biological production ; Marine resources ; Cruises ; Oceanic islands ; Coastal zone
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  • 25
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    Zooplancton en el estuario interior del Golfo de Guayaquil, durante mayo del 2001 (2008)
    Instituto Oceanográfico de la Armada, Guayaquil, Ecuador
    Details
    Publication Date: 2021-05-19
    Description: Los objetivos del estudio son conocer la situación actual del zooplancton con la finalidad de conocer la composición, distribución y abundancia de las comunidades del zooplancton, resaltando las áreas de mayor productividad en el segundo eslabón de la cadena alimentaria. Establecer especies dominantes en la comunidad de quetognatos y su relación con los parámetros físicos en el estuario interior del Golfo de Guayaquil.
    Description: The present study reports in detail the distribution and composition of the zooplankton biomass in diferent places of the Gulf of Guayaquil and the main goal it is to know the areas of most productivity in the zooplankton. The most biomass of zooplankton was observed in the area of estuary Salado than in other areas in the study. The biomass was represented by microcrustacea the dominant group was Infra orden Brachiuran and it was observed the most at the station located in front of Quiñonez Island. The low zooplankton biomass was registered at the station located the area of the bridge ways around of Guayaquil city. The zooplankton community was represented by 17 taxa and 10 represented the Crustacea kind and it registered the most diversity at the estuary Salado and low diversity was observed at the bridge of ways around Guayaquil. The phylum Arthropoda showed a broad distribution and observed the abundance of insect larvae at Miraflores bridge it is not usually observed in the examples of zooplankton. The chaetognaths phylum showed that Sagitta bedoti was dominant and it may be considered a indicative changes on saltiness rate, in the area where the blend process between the Guayas River and Salado estuary happens.
    Description: Incluye ref.bibl., grafs.
    Description: Published
    Keywords: Biological production ; Estuaries ; Distribution ; Biomass ; Zooplankton ; Salinity ; Composition ; Distribution ; Biomass ; Zooplankton ; Salinity ; Abundance ; Biological production ; Estuaries ; Estuarine organisms
    Repository Name: AquaDocs
    Type: Journal Contribution
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  • 26
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    Cambios de la densidad de los cladóceros P. avirrostris y E. tergentina durante las épocas cálidas y frías (Dic. 2004 y nov. 2005) en la Bahía de Santa Elena (La Libertad - Ecuador) (2008)
    Instituto Oceanográfico de la Armada, Guayaquil, Ecuador
    Details
    Publication Date: 2021-05-19
    Description: El objetivo del presente estudio es determinar los cambios poblacionales durante las estaciones cálida y fría de este grupo taxonómico y del zooplancton acompañante más abundante en aguas de la Bahía de Santa Elena vs. las variables ambientales temperatura y salinidad.
    Description: The present work is based on the cuali-quantitative zooplankton analysis and frequency of present groups regarding 240 plankton samples collected twice a month in 6 stations in coastal superficial waters during the winter and summer in front of Santa Elena's Bay (La Libertad) between december 2004- november 2005. It were determined 19 zooplankton groups, being the dominant ones: cladocera Penilia avirrostris and Evadne tergentina, copepod, eggs and larvae of fish and brachyura zoeas. Two cladocera species were determined: species Penilia avirrostris and Evadne tergentina; their distribution in dry season is notorious with a numerous population of P. avirrostris, when the temperature of the sea reports ranges from 20 to 22°C.
    Description: Incluye ref.bibl., grafs., tbls.
    Description: Published
    Keywords: Zooplankton ; Coastal waters ; Zooplankton ; Seasonal variations ; Coastal waters ; Community composition ; Population number
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  • 27
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    Composición y variación estacional del fitoplancton, zooplancton y microbentos en el estuario interior del Golfo de Guayaquil, durante el año 2003 (2008)
    Instituto Oceanográfico de la Armada, Guayaquil, Ecuador
    Details
    Publication Date: 2021-05-19
    Description: El presente trabajo comprende el estudio de la distribution cualitativa y cuantitativa del fitoplancton en el Golfo de Guayaquil, durante dos épocas: Húmeda y seca. El propósito del presente trabajo con respecto al zooplankton está orientado a conocer los cambios en la composición, abundancia y diversidad del zooplancton y en particular el Phyllum Chaetognatha con el objetivo de relacionar la distribución de las especies de Quetognatos con los parámetros físicos. En lo relacionado al estudio del microbentos, se pretende estudiar la composición específica y la abundancia relativa de las especies de la microflora béntica y de la microfauna bentónica y su relación con factores ambientales.
    Description: The present work comprehends the study of the qualitative and quantitative distribution of the phytoplankton in the Gulf of Guayaquil, during two season: Winter and summer. There were identified 63 species in water samples and 79 species in samples with net of 50u in the community of the phytoplankton. The diatoms prevailed dominant and in smaller concentration the dinoflagellates, cianobacters flagellates and tintinnoids. The cell biomass was represented by Paralia sulcata and Skeletonema costatum, they were the most abundant species in all the area. In net samples of 50u the dominant species were: Polymyxus coronalis, Thalassiotrix frawenfeldii, Pseudonitzschia longissima y species benthics: Coscinodiscus perforatus y Cyclotella menenghiniana. The most biomass of zooplankton was registered at the 17 ava bright and the less productivity of zooplankton was registered at Daule River however it was observed a coexist a good diversity of zooplankton groups during season. Stablishment that the species of chaetognatha has a distributions variability in the space and temporal, during september was observed the hight diversity and destacated the most individual numbers density of S. peruviana, S. bodoti and S. neglecta at the Canal of Cascajal and Posorja areas. It was observed a broad distribution main of the species S. bedoti and S. neglecta in the Guayas river ecosystem where it was registered sporadic at 23 stations located near of Mondragon Island until the Canal of Cascajal. It was reported to first registered the species S. bedoti and S. neglecta at the stations denominated second of Perimetral bright and it is distribution continued until the Portete and 17 ava brights localized at interior ramal of Estero Salado during wet season. In the related to the study of the microbenthics, it is sought to study the composition of species and the relative abundance of the species of the benthics microflora and of the benthics microfauna and their relationship with environmental factors.
    Description: Incluye ref.bibl., grafs.
    Description: Published
    Keywords: Phytoplankton ; Biomass ; Zooplankton ; Benthos ; Geographical distribution ; Estuaries ; Diatoms ; Microorganisms ; Community composition ; Seasonal variations ; Phytoplankton ; Diatoms ; Biomass ; Zooplankton ; Microorganisms ; Benthos ; Geographical distribution ; Estuaries
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  • 28
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    Comunidades del plancton en la Caleta Aeolian de la Isla Baltra - Galápagos (Ecuador), durante 2005 (2008)
    Instituto Oceanográfico de la Armada, Guayaquil, Ecuador
    Details
    Publication Date: 2021-05-19
    Description: El propósito del trabajo es determinar la composición, abundancia de los grupos dominantes del fitoplancton y zooplancton, establecer las especies de Quetognatos y su relación con la temperatura superficial del mar durante marzo de 2005 correspondiente a la época húmeda.
    Description: During the study one collected superficial water samples in 12 stations distributed in the Aeolian Bay of the Baltra, Galapagos Islands to determine the primary productivity and secundary on the chain it would feed, the samples of plankton were collected during days 9 to the 13 of march of 2005. In relation to the biomass cellular one identified 24 species in the superface waterproof cloak and 84 species were determined in the samples of network of 50u. In the phytoplankton community, the diatoms prevailed dominant and in smaller concentration the dinoflagelados groups, silicoflagellates, cocolithoforids. In counts cells the dominant species in the area in study were Gymnodinium sp., Filamentos sp., Coscinodiscus excentricus, Thalassiotrix frauenfeldii. In the netwoork samples (50u), the typical water species were registered with high productivity characteristics; Corethron criophyllum, Chaetoceros peruvianus. As far as the zooplanktony productivity a greater biomass collected with the network of 335u in comparison with the network of 600u was determined, and it stands out that the hight biomass of zooplankton was in station 4. Additionally a proportional relation inversely between the abundances of Eggs of fish and taxa of Quetognatos was observed. As far as the species of Quetognatos the presence in abundance order was observed Sagitta neglecta, S. bedoti, S. pacifica, these species are typically of wet season.
    Description: Incluye ref.bibl., grafs.
    Description: Published
    Keywords: Plankton ; Primary production ; Biological production ; Phytoplankton ; Zooplankton ; Biomass ; Plankton ; Primary production ; Biological production ; Phytoplankton ; Zooplankton ; Biomass ; Abundance ; Community composition ; Fish eggs ; Surface temperature
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  • 29
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    Larvas de peces clupeiformes y microzooplankton en la estación fija "La Libertad" desde noviembre de 1999 a julio del 2000 (2008)
    Instituto Oceanográfico de la Armada, Guayaquil, Ecuador
    Details
    Publication Date: 2021-05-19
    Description: Uno de los principales objetivos es la evaluación de los impactos que los eventos de El Niño tienen en las poblaciones del ictioplancton, con especial referencia a huevos y larvas de especies de interés comercial. Para el efecto se utilizan también, a más de los datos oceanográficos, especies de foraminíferos planctónicos como indicadores del estado del ecosistema. En el presente documento se detalla la distribución de larvas de Sardinops sagax (sardina), Ophistonema sp., Cetengraulis mysticetus (chuhueco), Anchoa y Engraulis ringens (anchoveta) durante el primer semestre del año 2000.
    Description: The present paper is the result of the analysis of ichthyoplankton samples colected ten miles off shore from Salinas - Península Santa Elena, since november 1999 until july 2000. During this period it has been found two points of high secondary productivity: in subsurface waters ( 0-50 m depth) during may, and in surface waters during march. The biomass of microzooplankton, eggs and fish larvae Engraulidae and Clupeidae were found in high quantity in these months mainly between the 0-50 m depth. The interrelation among planktonic foraminifers species: Globigerina bulloides, Globigerinoides ruber, Globigerinella aequilateralis, G. menardii, G. dutertrei and G. sacculifer, characterized the surface equatorial waters with the influence of cold waters of the Humboldt Current during this study, specially in march. Fish larvae like Anchoa sp., Anchovia (anchoa), Engraulis ringens (anchoveta) y Cetengraulis mysticetus (chuhueco), were identify since march to july. C. mysticetus was the most abundant specie. High diversity of zooplankton and fish larvae E. ringens and Opisthonema sp. (pinchagua) ocurred in may of 2000 also.
    Description: Incluye ref.bibl., grafs., tbls.
    Description: Published
    Keywords: Biological production ; Biomass ; Zooplankton ; Distribution ; Environmental impact ; Fish larvae ; Ichthyoplankton ; Biological production ; Biomass ; Zooplankton ; Distribution ; Fish eggs ; Fish larvae ; El Nino phenomena ; Environmental impact ; Fixed stations
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    Type: Journal Contribution , Non-Refereed , Article
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  • 30
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    Estudio taxonómico de los quetognatos del Golfo de Guayaquil (2008)
    Instituto Oceanográfico de la Armada, Guayaquil, Ecuador
    Details
    Publication Date: 2021-05-19
    Description: El presente estudio se basa en el análisis de 42 muestras de plancton obtenidas en dos cruceros realizados en las estaciones lluviosa y seca (Enero 31 a Febrero 3; Junio 28 a Julio 3, 1978), en el Golfo de Guayaquil. Se realiza una revisión de las características morfológicas de valor sistemático para la identificación de 18 especies de quetognatos y que corresponden a tres géneros: Sagitta, pterosagitta y krohnitta. De las especies encontradas, Sagitta bedfordii es reportada por primera vez para aguas del Pacífico Oriental, en particular para el Golfo de Guayaquil. Finalmente se hace comentarios generales sobre la ocurrencia de las especies en el área de estudio así como de su distribución general en los océanos.
    Description: Incluye ref.bibl., ilus., tbls.
    Description: Published
    Keywords: Taxonomy ; Zooplankton ; Taxonomy ; New records ; Zooplankton ; Organism morphology
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  • 31
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    Contribución al estudio de los quetognatos alrededor de las Islas Galápagos (2008)
    Instituto Oceanográfico de la Armada, Guayaquil, Ecuador
    Details
    Publication Date: 2021-05-19
    Description: El presente estudio tiene como labor fundamental conocer la distribución cuantitativa de las especies de quetognatos y su relación con factores como la temperatura, salinidad y establecer áreas de alta productividad en las Islas Galápagos con la presencia de especies bio-indicadoras de afloramiento.
    Description: During the present study carried out around the Galápagos Islands a total of ten species were registered including 3 genus: Sagitta, krohnitta and Pterosagitta. The genus Sagitta represented the biggest number of species S. enflata and S. pacifica were very abundant with the 35% and 26% respectively, the same ones that were in all the stations and represented a distribution relatively homogeneus in the area of study. Another species of genus Sagitta registered a common and relative abundance among them a S. hexaptera with a 5% after that S. bierii, S. bedoti with 2% each one and the species S. reguíaris and S. pulchra with a low 1%. Some specimenes don't contribute a clear identification because they registered a juvenil characteristic that corresponds to 24% a sagitta sp. Besides the genus Krhonitta and Pterosagitta were found, these represented two and one species respectively, species that represent a rare relative presence K. subtilis showed 3% while K. pacifica and P. draco together with one percent. Finally there are confirmed the existence of upwellings areas located in the south of Isabel Island, because of presence of S. hexapter and K. Subtilis whose habitat are intermediate and deep water and can be considered a indicator of upwellings.
    Description: Incluye ref.bibl., grafs., ilus.
    Description: Published
    Keywords: Zooplankton ; Environmental factors ; Indicator species ; Population density ; Indicator species ; Upwelling ; Zooplankton ; Marine invertebrates ; Population density ; Environmental factors
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  • 32
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    Quetognatos de las Islas Galápagos durante el crucero oceanográfico del 17 al 26 de noviembre de 1978 (2008)
    Instituto Oceanográfico de la Armada, Guayaquil, Ecuador
    Details
    Publication Date: 2021-05-19
    Description: Este estudio se refiere a los quetognatos obtenidos en las muestras colectadas en las Islas Galápagos entre el 17 y 26 de noviembre de 1978 a bordo del "BAE ORION". Está basado en arrastres planctónicos realizados verticalmente desde varias profundidades, la máxima de las cuales fue 150 m, a la superficie, usando redes de 600 micras de malla. Dieciocho especies estuvieron presentes en las muestras, todas epiplantónicas, excepto S. decipiens, especie mesoplanctónica. Se discute su distribución geográfica y su relativa abundancia. Las especies más abundantes, en orden decreciente de abundancia son: Sagitta enflata, Pterosagitta draco, S. pacifica, S. hexaptera, Krohnitta subtilis, S. bedoti, K. pacifica. La presencia en las muestras (especialmente al Sur, este y Oeste de la Isla Isabela9 de las especies S. hexaptera, k. subtilis, y s. decipiens, todas generalmente habitantes de los estratos subsuperficiales, sugiere el posible desarrollo de afloramientos en estas áreas.
    Description: Incluye ref.bibl., ilus., tbls.
    Description: Published
    Description: Quetognatos
    Keywords: Zooplankton ; Cruises ; Zooplankton
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  • 33
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    Comunidades del zooplankton en los ríos Teaone, Esmeraldas, Terminal Petrolero y el balneario Las Palmas de Esmeraldas, durante el 2004 (2008)
    Instituto Oceanográfico de la Armada, Guayaquil, Ecuador
    Details
    Publication Date: 2021-05-19
    Description: Los estudios del zooplancton en diferentes áreas principalmente en el río Teaone, Esmeraldas y la zona marino costera frente a la ciudad que incluye, el área del balneario Las Palmas, en el último año se ha intensificado con el objetivo de obtener un conocimiento detallado de la presencia de estos organismos y las características físico-químicas que condicionan su abundancia y distribución.
    Description: The present study was carried out during the wet and dry seasons in the rivers Teaone, Esmeraldas, Petrolero Terminal and Palmas, for which stablished that a variability exists temporary space as for the abundance and composition of the communities zooplankton, especially the species of the taxa Chaetognatha, Cladocera, Caridea. The area of major productivity zooplanctónica associated with a high diversity was in the zone of Petrolero Terminal of Esmeraldas during the wet season. In the area Petrolero Terminal there was high abundance of Quetognatos's species represented by the dominancia of S. bedoti and S. neglecta in the wet season and during the dry season the dominancia was od S. enflata and S. minim which con be related principally by the seasonal variation of the parameter salinity, whereas the temperature was kept in a range of 25.9° to 28.4 °C during 2 season in study. The low zooplankton abundance and diversity registered in the river Teaone, there being registered the presence of scanty specimens of Macrobranchium rathbunae in the wet season. In the river Teaone were observed high values of potential of hydrogen in comparison with other areas in study, for what, it might catalogue that this area is in conditions of a deterioration of the quality of the waters, by light indications towards a pollution product of the antropogénica activities.
    Description: Incluye ref.bibl., grafs.
    Description: Published
    Description: freshwater environment
    Keywords: Zooplankton ; Biological production ; Water quality ; Salinity ; Hydrogen ; Species diversity ; Community composition ; Zooplankton ; Biological production ; Salinity ; Hydrogen ; Water quality ; Temporal variations ; Species diversity
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  • 34
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    Procesos planctónicos en el Golfo de Guayaquil (Campo Amistad) julio-agosto/2001 (2008)
    Instituto Oceanográfico de la Armada, Guayaquil, Ecuador
    Details
    Publication Date: 2021-05-19
    Description: El presente trabajo es una contribución al estudio del fitoplancton y zooplancton marino-estuarino y su relación con las condiciones ambientales físico-químicas presentes en el entorno de la plataforma Amistad de producción de gas (Campo Amistad - Golfo de Guayaquil Externo), realizada por el Instituto Oceanográfico de la Armada en el B/I ORION durante julio-agosto del 2001.
    Description: This research is part of an environmental monitoring of plankton and its physical and chemical response around the platform located offshore Campo Amistad, near Santa Clara Island, southeast of the Gulf in external Guayaquil. The study was carried out between july 30 and august 31-2001, onboard the R/V Orión of te Oceanographic Institute of the Ecuadorian Navy. The chlorophyll "a" biomass presented values between 0.6 and 1.52 mg/m³ in surface waters, with averages of 1.07 to 0.99 mg/m³ (10 m), 0.79 (20 m) and 0.58 (30 m) mg/m³. The larger amounts of biomass and daily variability were found in the northern part of the platform, while the opposite trend was observed in its western area. One hundred and three phytoplankton species were identified, with dominance of centric diatoms of mainly Skeletonema costatum and Chaetoceros curvisetus. Dinoflagellates presented high diversity and low biomass; Ceratium dens was the dominant species, characterizing influences of external water masses in the estuary. The zooplankton fauna was represented by 28 groups, with dominance of cladocera and copepods; the highest density of organisms was found the 17h00 hours. High density of cladocera presented a strong positive relationship to phytoplankton abundance, and a negative correlation to copepod abundance. The environmental conditions in the surface thermal structure were almost stable, with an average of 22.5°C. The lowest temperatures were found southwest of the platform (subsurface), coincident with a slight increase in nutrients (nitrate and silicate). The marine biota associated with these environmental conditions presented high diversity, implying the absence of eutrophication incidence in the estuary area of the platform.
    Description: Incluye ref.bibl., grafs.
    Description: Published
    Keywords: Biomass ; Zooplankton ; Phytoplankton ; Chlorophylls ; Environmental assessment ; Biomass ; Chlorophylls ; Nutrients (mineral) ; Zooplankton ; Phytoplankton ; Environmental assessment ; Production platforms
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